That's strange- I've always heard that turbo's are considerably less reliable than superchargers. It's true that most of the time you'll make more power with a turbo, but in doing so you lose bottom end torque.
Superchargers tend to be more efficient than turbos and it generally runs in this order (least to most)
-Roots Blower (NOT EATON TYPE)
-Turbo or centrifugal supercharger
-Modified Roots Blower (like eaton with the slightly twisted rotors)
-Screw type Supercharger (Lysholm Supercharger)

Although they are difficult to find (1 or 2 companies in Australia importing them) the screw type is the best option. They give a MUCH flatter boost curve than any of the others and don't heat up the air as much or take as much power from the crankshaft.

To put this into perspective, simply swapping the Eaton supercharger for a Screw type of equal disp/rev will produce a 40hp increase in the supercharged Jaguar XJR/XKR motors.

There is another interesting advantages to superchargers, one which isn't immediately obvious. In off boost conditions, they still heat up the air, thus giving a lower density charge to the engine and so improving fuel economy.

[QUOTE=madmelon]That's strange- I've always heard that turbo's are considerably less reliable than superchargers.
You are misinformed
It's true that most of the time you'll make more power with a turbo, but in doing so you lose bottom end torque.
misinformed again , even a low preasure turbo makes an increase in torque from very low revs
Superchargers tend to be more efficient than turbos and it generally runs in this order (least to most)
unfortunatly blowers need a lot of horses to turn them , suddenly they are not so efficient in real terms
-Roots Blower (NOT EATON TYPE)
-Turbo or centrifugal supercharger
-Modified Roots Blower (like eaton with the slightly twisted rotors)
-Screw type Supercharger (Lysholm Supercharger)

Although they are difficult to find (1 or 2 companies in Australia importing them) the screw type is the best option. They give a MUCH flatter boost curve than any of the others and don't heat up the air as much or take as much power from the crankshaft.
Turbos do not remove crank hoses period , they do absorb a lot of the power dumped out the tail pipe which in effect is "free" no horsepower robbing belts to turn that blower.

To put this into perspective, simply swapping the Eaton supercharger for a Screw type of equal disp/rev will produce a 40hp increase in the supercharged Jaguar XJR/XKR motors.

relevence ??

There is another interesting advantages to superchargers, one which isn't immediately obvious. In off boost conditions, they still heat up the air, thus giving a lower density charge to the engine and so improving fuel economy.

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